Safety release device.



H. W. SPBLLMAN & E. TWIGm SAFETY RELEASE DEVICE.

APPLICATION FILED JAN,xs1.1912.

Patented Jan= 28, 1913.

LAG,

fN-ITED sTATEs PATENT OFFICE.

'HERBERT W. SAI'PELIMAN AND ERNEST TWIGG, OF NEW BRITAIN, CONNECTICUT,ASSIGNORS T LANDERS, FRARY AND CLARK, OF NEW BRITAIN, CONNECTICUT,

.a COEPOEATION.

Specification of Letters Patent.

PatentedJ an. 28, 1913.

Application filed January 19, 1.912. Serial No. 672,061.

' To aZ-Z whom it may concern:

lvm'atically opening the mill disk 'whenre- A.so

'leased .from rotation and with reference to 'convenience ofreadjustment after release.`

In the accompanying drawing z-'Figure 1- 1s anelevatlon'of a part/,cfamill shaft,

the feed Worm 'andi the moving disk flange and disk, togetherfwithoursafety release applied thereto, also/a part of a mill case, a step :andan adjusting 'screw in section. Fig. 2'is an end view of the said shaft,showing one sideof the' disk flange` andthe said release. Fig. 3 is alike view of 'the same with vthe parts in thfposition they haveimmediaV` ily after the releaseis. first tripped. Fig. t is a like viewofthe. same in the po# sition the'parts `have when at rest, after arelease. l Fig.,5 is an end view of the collaror hub on which the"driving shoulders are formed. Fig. 6 is an venlarged broken sectionalview' of the release, etc.,jon the line w of Fig. 2, the mill disk beingomittedV and "Lithe shaft shownin elevation. l.

A designates `th` A.shaft of coffee upa. which iss @use or hub 7- thatis fixed l upon the said fshaftin` ,any ordinary manner, las for exampleby'riieans of a pin 8, so that the said collar rotates with. the saidshaft, This collar has one or more substantiallj'f radial drivingshoulders 9 andthe same shoulders. The disk-flange' 11 and feed worm'12, are or may be bored through axially to t the shaft A upon which theyare feo mounted loosely ,enough to'permit the shaft to turn freelythereinvwhen the disk iiange lis released from rotation with saidshaft.

The mill disk 13, for convenience of construction, is made separately.from the disk flange and secured thereto Jn any proper manner as vforexampleby' screws 14.} Whextggi number of end faces y10 adjacent tothesaid the disk is so mounted and secured, the two m'ove together the sameas if formed in one piece. use the disk flange is slipped along on theshaft A up against the collar 7, as shown, `and the parts are run inconnection with a fixed mill disk and case of any ordinary construction.For the purpose of forming, in effect, a shouldered projection on theouter end of the diskiiange, adjacent to the shaft, we place a washer 15thereon, but it is not necessary that the same should be formed as a`separate piece from the said disk flange. The mill shaft -A is confinedagainst moving endwise in the direction to separate the mill disks," bymeans of an adjusting screw 2 7 and step 28 in a part of the mill case29 in the' ordinary manner of grinding mill adjustments.

In order t0 drive the moving disk 13 .with

the shaft A and release the disk therefrom in case of undue obstruction,as for example, the introduction between the disks of a stone or a nail,and also to open up the disks at the time of release, we employ inaddition to the driving shoulder 9 and end' face 10, a curved'lever 16,spring 17 and turn button 1 8. In order to facilitate moving the buttoninto place on the top of the shouldered projection, one or the other maybe beveled as for example, the beveled corner 19 of the button. The saidlever is pivotally mounted on one side of the disk flange 11 by means'adjustingscrew 24:, and by its other end with the 'outerend of thecurved lever, so as to have a constant tendency to hold the said leveragainstthestop 22. 'The said c urved lever is provided at its inner?edge, adjacent to the turn button, with a holding shoulder 2 6,y whichis slightly inclined and faces in a ,directiony to vstop the-movement of'theturn .button-when'theend nearest the said lever y Amoves towardthe'aXisv of thesaidslever.

When the turnv button ystainls inthe position shownfin Fig.' 2, one .endbears' agai'nstthcV v inner edgef'offthe lever` soasjto hold that 1 Fig. 6. shaft is turned in the proper direction, as Y indicated by thecurved darts in Figs. 2, 3

l there is undue strain or resistance, the presvsure of: *thel driving'-shoulder against Vthe lever slightly away from the stop 22, while thesaid turn button may at the same time have one side, near its end, incontact with the holding shoulders'ofthe said lever. In additionthereto, the end of the disk flange, one'end of the turn button and endface 10 on the collar 7 AWill be in engagement A-When the' shaft A isforced' to'ward lthe mill diskv by the mill adjusting 'screw 27. Thevend face 10 on the collar isa distance from that end 'of the said collarivhich faces the disk ange labout equalto thel thickness of theturnjbutton measured in the longitudinal direction of themill shaft, sothat thesaid parts hold the disk flange -away from thevv shoulderedAprojection thereon as shown in When so arranged, and the mill and 4, adriving shoulder@ of the collar 7 engages the turn button, at one end,and forces the other end of said'button against the holding shoulder ofthecurved lever so' as to drive-the moving disk with the shaft,

vso long as no undue 'strain Vorresistance is brought-:to bear on themoving disk. `The Aparts thus v'constructed may be set so as .to drivethe moving disk .with the shaft for the normal operation ofthe mill. byadjusting thetension 'of the spring 17. Whenever' turn button will forcethe opposite end of the `-said' button againstthe holding shoulder of.the curved lever with such-power a's to move the-lever outwardly andletthat end of the turn-'button pass the -s'aid shoulder, as shownl 1 inFig. The shaftthen rotates freely A 4. vvhile tlie flange and disk are.lstationary,

theibutton turning suriiiciently to permit `the driving-shoulder 9- topass i'tand the lever 16 ``isnthenrfiircjed against lfthe-'stop 22byflnthe' time;gthat .the disk. flange Ais releasedz .from

rotationfvvith vthe shaft, the movement of the tn'rn-button'in I nakingAsuch release, provided theshoul'dered"projectionl5 is present, will'l y,

on the shaft toward-the adjustingscrej and 4thereby open, up Vfthe milldisks aste loosen 'their grip' on the-obstructioifthat may:

lagainst the' inner edgegpffthcurved'lever at' a pointoutside of theholdingshoulder and then up against the said shoulder, thereby forcingthe lever' outwardly to throw the tension of the spring on saidleveran'd'the force thereof from the-said lever to the end of the turn,button.' The shaft and collar' =may then 'be adjusted forhavingadriving` .shoulder and end face of the said collar engage Aone end -ofthe but-tomall as beforev described and shown in Figsfl, and 2, wherebythe disk Will be .again driven,'as soon as the rotation of the shaftvforces one of the` driving shoulders upon the turn button.

We claim as our invention A, u 1.' In a mill, .the combination of'ashaft, a disk loosely mounted `thereon, a driving.

shoulder rotating with the said shaft', a lever; pivotally mounted onthe said .disk'and pro.

vided with a holding shoulder at its inner edge, a spring'forholdingthps'aid lever inwardly and a turn -button mounted on the said disk forengaging the said holding shoulder by one end While its'other'end isengaged byl the's'aid driving' shoulder.

l '2.g In a mill, the combination of a shaft, i'

a disk looselyV mounted thereon, a driving Ashoulder rotating with thesaid shaft, a'lev'erv .pivotally mountedon the said disk a11'd" provvided with a holding shoulder at itsinner.

edge, a spring Jfor holding thesaid leverfinf Wardly, al turn buttonmounted on the disk for engaging theisaid holding f'shrmlderl by oneendy While its otherend is engaged by the said driving shoulder andmeans for adjusting the tension ofthe 'saidspring to vary theresistancethat may be to trip the turn button.

required u,

1: 3. In vav mill, the combination of a means .for holding thesaid shaftagainst lon tudinalmovement in one direction, a.

` dis loosely'mounted onthesaid shaft, .a col-1 lar or hub v.on'the said'shaft having a substantially. radially arranged-driving shoul der andan end face adjacentagthereto, a lever .u

pivotally monnted'onthe said diskandproyided with a holding shoulder atits innerA edge, a spring' acting Aon the saidv lever and ajoswtnrmbutton mounted o'nj the'said disk foi- 'engaging the said: lever'and collarv and also forllengagingthe confronting faces of. the

said collar and disk.-

HERBERT 2W.' -srELL-MAN.

ERNEST-TWG@ f

